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Very nice! Thanks for the idea. How'd you do that? Need to remove each rotor first?
No, it's even more simple than that. Wipe down the entire rotor while still on the car with a good cleaner (I use lacquer thinner as it leaves little or no residue). Get a 12"x12" or so piece of cardboard. Hold the cardboard behind the rotor to prevent overspray from getting on the suspension pieces. Paint the rotor 1/4-1/3 at a time on the side opposite of the caliper. Let the paint dry before rotating the rotor to paint the next section (you don't want to get wet paint on the brake pad). After painting the entire rotor and it's all dry, on your first brake application the paint will scrape off the contact area leaving the remaining rotor painted including the cross-drilled divots.
I used VHT brake caliper paint for it's heat resistance available at Autozone or Advance. If I remember correctly, it's supposed to be able to withstand temps to 900 deg.
While the wheels are off and you're waiting for the rotors to dry, wax the barrels of your wheels to help shed brake dust accumulation and make them easier to clean.